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From Pat Ferrel <>
Subject Re: java.lang.OutOfMemoryError with Mahout 0.10 and Spark 1.1.1
Date Tue, 21 Jul 2015 16:58:17 GMT
That should be plenty of memory on you executors but is that where you are running low? This
may be a low heap on your driver/client code. 

Increase driver memory by setting MAHOUT_HEAPSIZE=6g or some such when launching the driver.
I think the default is 4g. If you are using Yarn the answer is more complicated. 

The code creates a BiMaps for your user and item ids which will grow with the size of your
total string storage needs, are your ids very long? With the default 4g of driver memory and
the latest released 0.10.1 (be sure to upgrade!) or master-0.11.0-snapshot code I wouldn’t
expect to have this problem. 

The current master mahout-0.11.0-snapshot has better partitioning as Dmitriy mentions but
it is built for Spark 1.3.1 so not sure if it is backward compatible. Some things won’t
work but spark-itemsimilarity may be ok. Somehow I doubt you are running into a partitioning

On Jul 20, 2015, at 2:04 PM, Dmitriy Lyubimov <> wrote:

assuming task memory x number of cores does not exceed ~5g, and block cache
manager ratio does not have some really weird setting, the next best thing
to look at is initial task split size. I don' think in the release you are
looking at the driver manages initial off-dfs splits  satisfactorily (that
is, in any way at all). Basically, you may want smaller splits, more tasks
than what DFS gives you from the beginning. These apps tend to run a bit
better when splits do not exceed 100...500k non-zero elements.

I think Pat has done some stop-gap measure on current master for that
(which i don't believe is a true optimal thing to do though).

On Mon, Jul 20, 2015 at 1:40 PM, Rodolfo Viana <
> wrote:

> I’m trying to run Mahout 0.10 with Spark 1.1.1.
> I have input files with 8k, 10M, 20M, 25M.
> So far I run with the following configuration:
> 8k with 1,2,3 slaves
> 10M with 1, 2, 3 slaves
> 20M with 1,2,3 slaves
> But when I try to run
> bin/mahout spark-itemsimilarity --master spark://node1:7077 --input
> filein.txt --output out --sparkExecutorMem 6g
> with 25M I got this error:
> java.lang.OutOfMemoryError: Java heap space
> or
> java.lang.OutOfMemoryError: GC overhead limit exceeded
> Is that normal? Because when I was running 20M I didn’t get any error, now
> I have 5M more.
> Any ideas why this is happening?
> --
> Rodolfo de Lima Viana
> Undergraduate in Computer Science at UFCG

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